{"id":"9ca91384-3f75-4174-83cd-af94c0c34777","shortId":"k5M2pn","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers receive a 402 challenge with payment details, settle in USDC, and get their response.\n\nThe specific endpoint at `/api/v1/transfers/153` is listed as \"Premium API Access\" and accepts POST requests. The 402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation endpoints — all at the same $0.02 price point. Documentation pages exist but appear to require wallet connection and contain no visible content. No OpenAPI schema or detailed request/response documentation was found, so the exact input parameters and response format for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or request/response schema available — input parameters and response format are unknown","Documentation pages (/docs, /pricing, /api, /README) appear to require wallet connection and contain no visible content","The specific purpose of /api/v1/transfers/153 ('Premium API Access') is not documented; it does not match any of the named endpoints on the landing page","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/153","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transfers/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response documentation, and the docs pages are empty (wallet-gated). The purpose of the specific '/transfers/153' endpoint is unclear beyond the generic 'Premium API Access' label, making it essentially a stub 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'/request':13,28 '0.02':12,27,58,133,186 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':127 '20000':122 '2913':128 '300':148 '402':88,116 '6':137 'Base network API' 'USDC micropayment API' 'accept':112 'access':110 'across':46 'address':144 'advertis':118,154 'ai/ml':49 'analysi':163 'analyt':48 'api':5,20,37,70,109 'appear':193 'base':8,23,66,123,130 'base-network' 'broad':42 'broader':152 'call':4,19 'caller':85 'categori':155 'challeng':89,117 'classif':166 'commit':77 'connect':197 'contain':199 'content':202 'convers':178 'cost':57 'crypto-paid API' 'data':47,159 'decim':138 'detail':92,207 'document':189,209 'embed':167 'enabl':36 'endpoint':45,56,102,181,223 'equal':132 'estim':175 'everi':55 'exact':214 'exchang':170 'exist':191 'export':160 'feed':169 'finance/web3':51 'format':219 'found':211 'gas':174 'generat':180 'geocod':176 'get':97 'given':134 'handl':82 'includ':156 'infer':50 'infrastructur':53 'inlin':84 'input':215 'insight':161 'json-response' 'key':71 'limit':74 'list':106 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':120 'metric':157 'network':9,24,67 'no-api-key' 'offer':40 'openapi':204 'page':190 'paid':61 'paramet':216 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':83,91,140 'per':3,18,59 'platform':6,21,38,153 'point':188 'post':113 'post-endpoint' 'premium':108 'premium API access' 'price':168,187 'protocol':81 'quot':173 'rate':73,171 'receiv':86 'report':158 'request':60,114 'request/response':208 'requir':78,195 'respons':99,218 'schema':205 'second':149 'sentiment':162 'set':43 'settl':93,142 'specif':101,222 'summar':165 'text':164 'timeout':150 'token':172 'unit':124 'unknown':225 'usdc':15,30,63,95,126,135 'usdc-settlement' 'util':54 'valid':177 'via':10,25 'visibl':201 'wallet':196 'x402':11,26,35,80 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bae32e1c-135e-4034-99db-6af8bed38a73","listingId":"9ca91384-3f75-4174-83cd-af94c0c34777","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transfers/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:27.619Z"}],"sources":[{"listingId":"9ca91384-3f75-4174-83cd-af94c0c34777","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:27.619Z","lastSeenAt":"2026-04-23T03:32:01.529Z"}],"details":{"listingId":"9ca91384-3f75-4174-83cd-af94c0c34777","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/153 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/153"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data/AI/finance endpoints without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.037Z"},"updatedAt":"2026-04-23T03:32:01.529Z"}}